define(['./_root', './toString'], function(root, toString) {

  /** Used to match leading and trailing whitespace. */
  var reTrimStart = /^\s+/;

  /* Built-in method references for those with the same name as other `lodash` methods. */
  var nativeParseInt = root.parseInt;

  /**
   * Converts `string` to an integer of the specified radix. If `radix` is
   * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
   * hexadecimal, in which case a `radix` of `16` is used.
   *
   * **Note:** This method aligns with the
   * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
   *
   * @static
   * @memberOf _
   * @since 1.1.0
   * @category String
   * @param {string} string The string to convert.
   * @param {number} [radix=10] The radix to interpret `value` by.
   * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
   * @returns {number} Returns the converted integer.
   * @example
   *
   * _.parseInt('08');
   * // => 8
   *
   * _.map(['6', '08', '10'], _.parseInt);
   * // => [6, 8, 10]
   */
  function parseInt(string, radix, guard) {
    if (guard || radix == null) {
      radix = 0;
    } else if (radix) {
      radix = +radix;
    }
    return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
  }

  return parseInt;
});
